g.tec medical engineering GmbH
g.HIamp, USB Biosignal Amplifier: Instruction for use
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V2.16.01
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2 Introduction to g.HIamp
g.
®
HI
amp is g.tec’s multi-channel high-end biosignal amplifier with USB technology. The device allows
the acquisition of up to 256 biosignal channels such as EEG (Electroencephalogram) with 24 bit. The
sampling frequency can be set up to 38400 Hz.
The USB amplifier can be connected directly to a PC or notebook with an USB connector without any
additional data acquisition device needed. Each channel is equipped with a synchronized analog to
digital converter to perform the simultaneous sampling. Each analog to digital converter is operating
with 614.4 kHz and performs a 16 times oversampling. This results in a sampling rate of 38400 Hz for
each channel. A powerful floating point DSP performs an additional decimation and the real-time
filtering of the biosignal data. The sampling frequency can be adjusted between 256 Hz and 38400 Hz.
Therefore, a sampling frequency of 256 Hz yields to an over-sampling rate of 2400 with a very high
signal to noise ratio.
Furthermore, the device has an internal impedance check unit. Standard electrodes with safety
connectors can be connected to g.HIamp via optionally available electrode connector boxes. The
device is controlled with a C language Application Programming Interface (C API).
g.HIamp 256-Channel Amplifier